Tell libsodium not to download code from savannah.gnu.org in autogen.sh.

Author: graydon

autogen.sh

@@ -20,6 +20,14 @@ case "$1" in
 	;;
 esac
 
+# NB: the DO_NOT_UPDATE_CONFIG_SCRIPTS variable is here to inform libsodium not
+# to download a fresh config.sub and config.guess from git.savannah.gnu.org
+# (which is sometimes offline).
+#
+# This variable was how you disable the update in libsodium up to version
+# 1.0.18; but in master they have changed this, so on the next libsodium
+# submodule bump we'll want to change the code here to the new interface
+# (running `autogen.sh -b` in the libsodium directory)
 
 case "${skip_submodules}" in
     0|no|false|"")
@@ -28,7 +36,7 @@ case "${skip_submodules}" in
             autogen=$(find . -name autogen.sh)
             if [ -x "$autogen" ]; then
                 cd $(dirname "$autogen")
-                ./autogen.sh
+                DO_NOT_UPDATE_CONFIG_SCRIPTS=1 ./autogen.sh
             fi
             '
     ;;